User guide

DS1254
13 of 17
Figure 10. BATTERY WARNING DETECTION (Note 3)
BATTERY WARNING TIMING (0
°
C to +70
°
C; V
CC
= 5.0V±10%)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Battery Test Cycle t
BTC
24 hr
Battery Test Pulse Width t
BTPW
1 Sec
Battery Test to BW Active
t
BW
1 Sec
V
CC
Valid to BW Valid
t
BPU
1 Sec 3
AC TEST CONDITIONS
Output Load: 100pF + 1 TTL Gate
Input Pulse Levels: 0.0V to 3.0V
Timing Measurement Reference Levels:
Input: 1.5V
Output: 1.5V
Input Pulse Rise and Fall Times: 5ns
BATTERY TES
T
ACTIVE
BW
V
CC
V
BAT
t
BPU
2.6V
t
BTC
t
BTPW
t
BW